4He + 12C, Elab=139 MeV

Beam quality: no dataTarget: 0.88 mg/cm^2 CH foilData obtained: author's graph digitizedThe experiment was carried out using a 139 MeV alpha-particle beam from the University of Maryland Cyclotron. The measurements extended over an angular region from 35 ° to 57.5°(1ab) with an incident beam intensity varying from a few nA at the smallest angles to 50 nA for the larger angles. The opening angle of the detector was 0.5°; the total solid angle was 1.4 x 10^(-4) sr. The uncertainty in the absolute cross sections is estimated to be 10% and arises primarily from the uncertainty in the target thickness.